Alleging that the victim was molested by the school principal, the family members lodged an FIR with the police after which the principal was picked up and later arrested, a senior district police officer said.

The incident took place yesterday during school hours when Mehta allegedly summoned the girl to his office for some work for which he required her help.

Returning from school, the girl informed her parents about the incident and an FIR was lodged by them, police said.